"The driver didn't believe it was a bullet, but upon inspection we identified it was a bullet," he said.

Detective Senior Sergeant Peachey said police had not made the incident public because they did not want to jeopardise the investigation in its early stages.

"We had our strategies in place and didn't want to jeopardise our investigation as we didn't know where the bullet had originated from," he said.

Police investigations are continuing and they have asked the public to assist, because they believe there may have been bystanders who saw the incident. They would like to speak with anyone who saw the incident.